Metal alloy for cable-casings and the like



4% Drawing.

um'rso STATES PATENT OFFICE.

DAVID STEITQUIST, F STOCKHOLM, SWEDEN.

moo-ole.

. I To all whom may concern:

Be it lniownthatl DAvn) STENQUIST 9.-

' subject of the King of Sweden, residing at Stockholm, Sweden, have invented new and useful Improvements ,in Metal Alloys for Cable-Casings-nnd the like, of which the following isu specification.

llhe present invention relates toe metal alloy consisting of lead and-magnesium for cable casings, and the like. "The chiiracter-I istic feature oi? the inventi n is that the con tent of .mngncsium is. 0. '1-0.1%. Such a -1netul'-olloy is specially adaptedgior re.

placing such lead alloys s contain in addition to leacl,"2 to 3% t n, and, vfvhicli are used particularly for ca ile casings. I The lead magnesium ellogvin questionhos the some properties in regard to resistance to breaking" strain, clesticitmend hardness. as

the said lead tin alloy with 2 to 3% tin.

Alloys of lead and tin prove comparatively expensive, owing to the high price of tin.

I have therefore sought to find o substitute for the the ingredient in the alloy. After experiments with different meiotic, such a substitute hes-been-found in magnesium. It w ll. be seen. that the nf'nount of magnesium 'required in the lead magnesium alloy in eocorclence with the present invention in order toohtein theinecessaryqualities of strength and resistance, is minute in comparison with the amount of tin which is required, when the letter metal is used. .In the said experiments, the most suitable amount of magnesium has been ascertoined to be about 0.05%.

, possible.

followi'ng mnnnerz -The lead is'melted and .lieated to a temperature slightly above its Byfiiumeifous tests and experiments, it

name to this specification.

METAL ALLOY FOR CABLE-CASINGS AND THE Specification of Letters .Patent. Patented N 23 1920,

Application filed October 16, 1919. Serial No. 331,125.

has been demonstrated that lead has a resis- 'tance to breaking strain'of 1.68 kilograms per square millimeter, a ductility of. get cents and hardness of 3.6. -It has also been found that, by the additionof magnesium beyond 0.12 perpent, there be precticolly no increase in the quelitieslreferred to,

x a lead tin alloy are 2.34:, 52 and 6.4. It will thus be seen that, with a 0.04 per cent. cou-v tent of Inegnesium,'the leod-magnesium alloy possesses characteristics epproximstely equal to-those of a lead-tin alloy having a tin. content of 3 per cent, and, therefore, owlng to the minute quantlty of magnesium employed, an alloy is produced which is very 'I he come-- 55 much cheaper than the lead-tin alloy, while possessing qualities that render it available for all of the purposes for which the letter isdesirnble.

What I claim is: i

1. Articles having'ductility, herdness and resistance to breakin r strain ap roximntely in the proportions o 39, 6.1.cn 2.5 respeo tively and consisting of lead and magnesium," the content of'iiiagnesium being from 0.0I to 0.1 per cent; l 2. Articles hiiving'ductility, hardness and resistanoeto breaking strain in roportions approximately equal to those oi a lend-tin ,elloywith a tin content of Qto 3 percent,

said articles consisting of lead and mag- 80 t I 1iesium,-the content of mngnesiumbeing 0.01 i he alloy is produced, for instance, In the to 0.]. per cent.

3. Articles having ductility, hardness and resistance to breaking strain, consistingpf lead and. magnesium, the content of mag nesium being from 0.01 to 0.1 per cent.

In testimony whereof Ihavc my DAVID s rnnoois'r. 

